Flying from Low to High pressure

[MooneyPilot]

When flying from low pressure to high pressure, the barometric error of a altimeter will cause the instrument to:
a. read true altitude, providing a correction is made for temp
b. Overread the true altitude of the aircraft
c. Indicate higher altitude than the correct one
d. Underread the true altitude of the aircraft


I know what the answer is but cant see it in my head,,,anyone can describe this

 

[minitour]

High to low look out below
Low to high clear the sky

Draw three boxes (squares) on a piece of paper...all three are different sizes, but all three start at the bottom of the paper...the one farthest to the left is the largest and the one to the right is the smallest...the one in the middle is in between sizes...what you should end up with is "steps" kind of...only squares...

on top of those squares, draw your airplane...

okay...the biggest one is LOW pressure...think not enough pressure to compress that square...the smallest one is HIGH pressure...think lots of pressure squeezing the air...

High to low look out below
Low to high clear the sky

think about your airplane flying across the ground (bottom of the paper)...as you reach each new "pressure", the airplane goes down or up the steps (depending on going low to high or high to low)...your altimeter will read the same thing (indicated altitude) because that is a constant pressure level you're flying at...

that's how I was shown when I "REALLY" got it...

hope that helps...

-mini

 

[Big Duke Six]

Excellent, Mini. That's a great example.

 

[minitour]

Excellent, Mini. That's a great example.

Thanks...much appreciated

-mini

*edit*
just for kicks, you can do the same thing with hot and cold temperatures to see the difference